Tacosnape, are there any interesting things you've learned about playing or building 4c Landstill for this tournament that you'd like to share? I'm in the process of getting it put together myself, and any extra tips before I unleash it on others would be excellent.
Just to add something, I would agree that 4 colors is perfectly viable. During my (admittedly limited) playtesting I found land hate easy enough to work around. And if rishadan port is really that much of a problem, run a few teferi's responses in the board. Having four colors means you can play pretty much anything you want, so solutions are bound to exist for your particular meta.